The complexity of writing client-side code using JavaScript in .NET web applications kept increasing in scenarios such as data-binding, server calls, and validations. .NET developers faced difficulties in writing client-side validations using JavaScript. So, they discovered and started using jQuery plugins for validations and mostly, just to change the views according to user actions. In the later stages, .NET developers were looked after by JavaScript libraries that ensure the structure of the code and provide good features to simplify the client-side code. Then, they ended up using a few client-side MVC frameworks in the market. However, they only used the MVC frameworks to communicate with the server and to update views.

Later, a trend of SPA (Single Page Applications) came into picture in the web development scenario. These kinds of applications will be served with an initial page, possibly in a layout view or master view. Then, the other views will be loaded onto the master view as and when requested. This scenario will be achieved by implementing client-side routing so that the client will request a small part of the view rather than the entire view from the server. Achieving these steps created more complexities in client-side development.

AngularJS came as a life saver for .NET developers by enabling them to reduce their efforts in performing client-side development of handling applications, such as SPA. Data binding is the coolest feature of Angular that enables the developer to concentrate on other parts of the application instead of writing huge code to handle data binding, traversing, manipulating, and listening to the DOM. The templates in Angular are simple plain HTML strings that will be parsed into DOM by the browser; the Angular compiler traverses the DOM to data bind and render instructions. Angular enables us to create custom HTML tags and extend the behavior of the existing elements of DOM. With the built-in support to dependency injection, Angular resolves dependent parameters by providing their instances implicitly.